Fuel-gas and air carburetor



Jan. 11, 1938.

P. M. SARTELL FUEL GAS AND AIR CARBURET OR Filed April 25, 1935 PAGE M. S ARTELL INVENTOR v aJ-LL ATTORNEY Patented Jan. 11, 1938 UNITED STATES PATENT Application April 23,

4 Claims.

My invention relates broadly to gas carburetors for internal combustion engines, and. more particularly to a manifold for mixing of a gas carburetor fuel with air.

The principal object of my invention is to provide a fuel mixing chamber that will produce a constant air-gas ratio at all engine speeds and under varying load conditions.

Another object is to provide a throttle valve for both air and gas passages that are controlled by a single shaft connection.

It is also an object of my invention to provide a device that is rugged, light in weight, and one that can be easily installed and manipulated.

The figure of the drawing is a view partly in elevation and partly in section of my improved carburetor, shown applied to a conventional intake manifold of an internal combustion engine.

My device consists of an outer shell or gas receiving member I I provided with a receptacle portion l3 that has a tapered section l4 terminating into a reduced neck or mixing chamber l5 and an air intake conduit 20 with the air intake 33. The conduit 20 is secured by screw H to a sleeve l6 of member H. The outer shell or gas receiving member I l is provided with an annular wall I2, which forms a bottom for the same. The conduit 20 has a Venturi nozzle 2| and, when the conduit is placed in position, it extends into the shell 30 I l with the end of nozzle 2| at the throat of mixing chamber I5. The space between the outer wall of receptacle portion l3 and the wall of conduit 20 forms the gas receptacle 20' that is provided with a suitable intake port 22. Threaded 5 into port 22 is a gas supply duct 23 that is in turn connected with pipe 24 leading from the conventional type gas supply control means (not shown) Both the air and gas supply used in producing a suitable fuel mixture in chamber I5 are controlled 40 by a single shaft 25 that has, in the air intake conduit 20, valve 28 secured to it by set screw 3! and that has, in the gas duct 23, the valve 29 secured to it by screw 32. The shaft 25 is suitably mounted in bearing apertures 26 in the walls of conduit 20 and bearing apertures 21 in the duct 23. A crank 30 is also secured to the end of shaft 25 so that valves 28 and 29 can be simultaneously operated by moving the crank. Thus, operating both valves by the same crank and shaft maintains a constant ratio of fuel-gas to air in the mixture in chamber l 5 at all engine speeds, varying load conditions and independent of the rate at which the mixture leaves the chamber.

My improved device can be readily attached to 1935, Serial No. 17,855

a conventional type manifold ill by any suitable way, such as flanges l8 and bolts iii.

In the operation of my device, gas as such, or hydrocarbon vapor is drawn past the valve 29 where it passes through port 22 into the concentrically arranged receptacle 28' which is of sufficient volume to allow expansion of the gas, thereby slowing down its velocity. The gas is then drawn off in a smooth even flow by suction created by the air flow passing through the Venturi nozzle 2| of conduit 20 and the air and fuel gas is mixed in chamber 15.

The arrangement of the air intake 33 of inner member 2|] is such that the air, after passing valve 28, flowsin a smooth, evenly distributed path through the Venturi nozzle 2! whereby the gas is also drawn into the mixing chamber in a flow evenly distributed throughout the chamber.

It will be noted from the foregoing operation of my fuel mixing device that the fuel gas is measured as it is throttled and the fuel gas and air are mixed after being throttled.

It will be understood that the above description and accompanying drawing comprehend only the general and preferred embodiment of my invention, and that various changes in construction, proportion and arrangement of parts may be made within the scope of the appended claims, without sacrificing any of the advantages of this invention.

I claim:

1. In a fuel gas carburetor for internal combustion engines, in combination, a mixing chamber having cylindrical walls, a fuel gas conduit having an outer wall of greater diameter in crosssection than said mixing chamber and positioned co-axially below said mixing chamber, a frustoconical portion connecting said mixing chamber and said fuel gas conduit, an air supply conduit extending through said fuel gas conduit and positioned co-axially thereof, a second frusto-conical portion connected to said air supply conduit, the small end of said frusto-conical members terminating at the intersection of said mixing chamber, an annular wall for closing the lower end of said fuel gas conduit, a fuel gas duct in communication with the lower portion of said fuel gas conduit, and control means in said fuel gas duct and said air supply conduit for supplying a constant ratio of fuel gas and air to the carburetor.

2. In a fuel-gas and air carburetor for internal combustion engines, in combination, a mixing chamber of uniform cross-section area, two conture flowing through the mixing chamber are maintained substantially constant.

3. The fuel-gas and air carburetor combination of claim 2, characterized by the smaller end of the inner hollow portion being of reduced thickness and Whose thinnest portion is at the termination of said portion.

4. The fuel-gas and air carburetor combination of claim 3, characterized by the smaller end of the inner hollow portion being reduced in 10 thickness at its smaller end to a knife edge.

PAGE M. SARTELL. 

